. >>> primary voting isunderway in the polls, mitt romney is hoping to win although a mistake could cost santorum votes. >> reporter: the polls are open, the voters are picking the one they want to challenge the president. it is a show down between mit roll knee mitt romney and rick santorum. >> i don't care what the unemployment rate will be. >> at a rally romney pounced on his rival's mistake. >> one of the people said he doesn't care about the unemployment rate. that doesn't bother him. i do care about the unemployment rate. >> santorum later admitted unemployment is important, going on to say the nation's economic troubles are symptoms of the government's intrusion into the lives of voters. occasionally you say some things you wish you had you know a do over. but you know what? i think it is important that you try to get a sense of how real the candidate is. you know mistakes and all. >> santorum hopes his method of restoring freedom will drive conservative voters in southern illinois to the polls today, delivering him a surprise win, romney is counting on republicans in chicago subu